cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A263796 Number of (n+1)X(5+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nonincreasing.

Table of values

n a(n)
1 4
2 4
3 14
4 17
5 61
6 130
7 494
8 1435
9 4917
10 13962
11 41366
12 107284
13 280438
14 666212
15 1574783
16 3468753
17 7560914
18 15618901
19 31856173
20 62297164
21 120205886
22 224230549
23 412782291
24 739028663
25 1306513751
26 2256420867
27 3851037496
28 6442700456

List of values

[4, 4, 14, 17, 61, 130, 494, 1435, 4917, 13962, 41366, 107284, 280438, 666212, 1574783, 3468753, 7560914, 15618901, 31856173, 62297164, 120205886, 224230549, 412782291, 739028663, 1306513751, 2256420867, 3851037496, 6442700456]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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